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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A man weighing 60 kg is standing on a trolley weighing 240 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a velocity of 1 ms⁻¹ (relative to the trolley), then after 4 s, his displacement relative to the ground is

Answer: (C)

Solution

Let the trolley's ground velocity be V. The man's ground velocity is V+1. By momentum conservation (initially zero):

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Question ID VK-152989